Proton mobility in the composites of iron acid sulfate monohydrate with silica

Пономарева, В. Г.; Burgina, E. B.; Tarnopolsky, Vasily A.; Yaroslavtsev, A. B.

doi:10.1070/mc2002v012n06abeh001667

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…Since this is a rather fundamental study no effort was made to develop optimized fuel cells with these composites. There are a number of studies on the enhancement of the conductivities of low or medium temperature proton conductors [5][6][7] by composite formation.…”

Section: Introductionmentioning

confidence: 99%

Proton conducting ceramics: Recent advances

Schober

Ringel

2004

Ionics

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Abstract.A general introduction into the field of high temperature ceramic proton conductors (HTPCs) is given. Results of two typical studies involving these HTPCs are discussed. In the first part a study of the processes occurring during water vapor exposure of bulk ceramic proton conductors, Bafeo.9YoAO2.95 (BCY10) and BaCe0.8Y0.202.9 (BCY20), is presented. A disc of a HTPC was connected to a mass spectrometer in a vacuum system permitting the identification of the species crossing the ceramic-vacuum interface. Exposing the other side of the sample to D20 led to a strong signal of D20 + after a certain lag time. From these lag times the tracer diffusivity of hydrogen could be determined as a function of temperature. The permeation of steam consisted of two components: a fast component, given by the diffusivities of deuterons (protons), and a slow component, assigned to chemical diffusion of deuterons (protons) coupled to oxygen vacancies. The data also suggested the possibility of participation of even more complex defects in this chemical diffusion. Dilatometry measurements of different specimens of BCY10 and BCY20 also revealed quite clearly this two-phase pattern during protonation. Diffusion measurements on protonic ceramic membranes using H2180 permitted the determination of the tracer diffusivity of oxygen. All of the above measurements were interpreted in the light of the chemical diffusion model developed by Kreuer et al.The second part deals with composites of proton conductors and inorganic compounds such as carbonates, hydroxides, chlorides, and fluorides following the work of B. Zhu. Conductivities of such composites are presented. Nernst potentials of various electrochemical cells with these composites are discussed.

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Section: Introductionmentioning

confidence: 99%

Proton conducting ceramics: Recent advances

Schober

Ringel

2004

Ionics

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“…There are a number of studies, however, on low and medium temperature proton conductors where a dramatic increase of proton conductivity with heterogeneous doping was demonstrated. 5,6 We study here composite systems of a HTPC plus an inorganic phase exhibiting high conductivities. A few cursory experiments on composites of the oxygen ion conductor Ce 0.8 Gd 0.2 O 1.9 are also included.…”

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Composites of Ceramic High-Temperature Proton Conductors with Inorganic Compounds

Schober

2005

Electrochem. Solid-State Lett.

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This work deals with composites of high-temperature proton conductors and inorganic compounds such as carbonates, hydroxides, and chlorides. Discontinuities were found in the T vs. 1/T plots which are ascribed to superionic phase transitions occurring in the interface region between the constituent phases. A similar superionic phase transition was also found between a composite of a proton conductor and a prominent oxygen ion conductor. The results provide a natural explanation for the high conductivities recently reported for similar composites of oxygen ion conductors and such inorganic compounds ͓B. Zhu, J. Power Sources, 114, 1 ͑2003͔͒ and also explains the high current densities obtained in intermediate temperature fuel cells based on such composites.

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Controlling the proton transport properties of solid acids via structural and microstructural modification

Пономарева

Лаврова

2010

J Solid State Electrochem

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Proton mobility in the composites of iron acid sulfate monohydrate with silica

Cited by 7 publications

References 11 publications

Proton conducting ceramics: Recent advances

Proton conducting ceramics: Recent advances

Composites of Ceramic High-Temperature Proton Conductors with Inorganic Compounds

Controlling the proton transport properties of solid acids via structural and microstructural modification

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